guest hangs on application

Description

Hello,

since I switched from OSE 1.6 to OSE 2.2.0 (2.1.2 and 2.1.4 had similar problem) I am having problem with one application: PlSql Developer (http://allroundautomations.swmirror.com/plsqldev715.exe). All is OK with this application, until I request to create a Explain Plan Window (menu File -> New -> Explain Plan Window). This hangs the inner part of the guest (the guest window itself is responding - I can issue pause/resume/reset/save/restore, none of them made the inner part of the guest respond (I get the unhang occasionally after several save/restore). I used GuestAdditions but after uninstalling, the problem is still present.

I had similar (or the same?) problem on 1.6, but it usually recovered from the hang in cca 1 minute to normal functionality (or after save/restore).